Development of New Beam Monitors Using Crystals

当电子束注入晶体时，会发生各种辐射现象，例如沟道辐射和参量X射线辐射（PXR）。如果沟道辐射的能量与PXR能量一致，则发生称为衍射沟道辐射（DCR）的新辐射过程。本工作的目的是观察DCR及其在束流能量测量中的应用。我们已经开发了一种实验装置，用于测量通过晶体传输的光束轮廓和用于检测来自晶体的X射线。我们已经成功地观察到沟道现象，通过测量的光束轮廓。此外，我们已经成功地观察到角分布的PXR从沟道电子。作为下一步，观测DCR的实验正在进行中。

When an electron beam is injected into a crystal, a variety of radiation phenomena such as channeling radiation and parametric X-ray radiation (PXR) occur. If the energy of the channeling radiation coincides with the PXR energy, a new radiation process called diffracted channeling radiation (DCR) takes place. The purpose of the present work is to observe DCR and its application to beam energy measurement. We have developed an experimental setup for measuring beam profiles transmitted through a crystal and for detecting X-rays from the crystal. We have succeeded in observing channeling phenomena through measurements of the beam profiles. Also, we have succeeded in observing angular distributions of PXR from channeling electrons. As a next step, the experiment for observing DCR is in progress.